Font rendering

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Original author	Amir Hassan (kallaballa) amir@.nosp@m.viel.nosp@m.-zu.o.nosp@m.rg
Compatibility	OpenCV >= 4.7

Render Hello World

Draws "Hello World" to the screen using NanoVG. Demos some basic font options.

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#include <opencv2/v4d/v4d.hpp>
 
using namespace cv;
using namespace cv::v4d;
 
int main() {
    cv::Ptr<V4D> window = V4D::make(960, 960, "Font Rendering", false, false, 0);
 
    //The text to render
    string hw = "Hello World";
 
    window->run([hw](Ptr<V4D> win){
        //Render the text at the center of the screen. Note that you can load you own fonts.
        win->nvg([hw](const Size& sz) {
            using namespace cv::v4d::nvg;
            clear();
            fontSize(40.0f);
            fontFace("sans-bold");
            fillColor(Scalar(255, 0, 0, 255));
            textAlign(NVG_ALIGN_CENTER | NVG_ALIGN_TOP);
            text(sz.width / 2.0, sz.height / 2.0, hw.c_str(), hw.c_str() + hw.size());
        });
 
        return win->display();
    });
}